I Have the following repository: https://github.com/vlio20/bfit in which I try to use R2DBC in order to do db operations in an async manner. I followed the following tutorial (but maybe it is outdated https://www.youtube.com/watch?v=DvO4zLVDkMs Here are the relevant dependancies of my pom: I am using the defa…
Tag: java
Custom Notification for incoming call not showing in android
I am trying to make a custom incoming call notification like WhatsApp for my app if I don’t use this custom layout then my notification is working. I am trying this for the first time any help will be appreciated. This is my FireBaseMessagingService Class This is my channel This is my FCMReceiver Class …
Remove numbers from a list that begins with a specif digit
For example, i have this list How i remove only the numbers that begins with “6” Answer There are several ways how you can approach this task: using an Iterator; by utilizing so-called traditional for loop; with a help of Stream IPA; using method Collection.removeIf(). Note that attempt to address…
Using Tree View in Java to implement a view of a filesystem with hierarchy
I’d like to create a tree view that displays a mod folder (the root directory) and the mods inside, but not the mod folders contents. Right now I can only get it to display all of the mod levels but I think its my method BuildChildren(). Any help would be appreciated. I’ve included the code below.…
How Spring Batch Step chunkSize and JpaPagingItemReader pageSize work together
Im developing a Spring Batch application. Although I’m getting more and more comfortable with it, I came across with something that is making me very confused. Please take a look at this step configuration. As you can see it’s a pretty standard step. My confusion is related to the chunk size (50) …
How to conditionally serialize a field
I want to conditionally serialize a field. I figured out how to conditionally ignore a field with But what I really want to do is to redact the field. So if I have I get Field2 is correctly ignored. But what I really want is I have another annotation, @MaskSensitiveData So what I want to do is combine them. S…
Java ClassVersionError although version seems to be okay
I’m getting the following error in my java web app (The application launches okay but when I click a button following error occurs). I’m using Tomcat (7.0.109) to run this application. java.lang.UnsupportedClassVersionError: FileDetailsServlet has been compiled by a more recent version of the Java…
My Spring JPA queries do not work with H2
This query below does not work and it generates me an exception When I used the MySQL database, the query worked fine. But now that I am using the H2 database, it suddenly does not work. Why? How do I fix this? Answer It would be better to use JPA. If you still wanna use nativeQuery, use like this:
iText paragraph.setRotationAngle changes text orientation
I’m trying to add some vertical texts to a PDF file, but when I rotate my paragraphs with setRotationAngle every space turn into a line break or the text orientation is changed, I’m not sure. The pictures show the result I expect and the result I’m getting. I’m using iText 7.1.0 at Net…
An underscore, a dot and a dash must always be followed by one or more alphanumeric characters without using Regex
I’m working on a school assignment that validates emails without using Regex. The premise of this exercise is to learn about methods and to practice our critical thinking. I understand that the code can be reduced to fewer lines. Right now, I need to check all conditions for the prefix of an email (The …